The answer is simple, dealers would be the ones doing those engine repairs. That is a win-win situation for them. Less money on the oil, more profit repairing.Frankly I would follow the manufacturers recommendation. Why are they recommending a blend over full synthetic? It's to their advantage to use the best "tool" for the job. Why cheap out on the lifeblood of their cars when it will cost them the difference +++ on repairing engines to save a few pennies in engine oil. YMMV.
Either use conventional or full synthetic, there is no qualification for how much synthetic is in a blend. The full synthetic these days are cheap enough so it's more beneficial to use the full synthetic.It does meet it. That is what my dealer uses so easy for me. . My point is, there are other oils that do not have the sticker but may be just as good.
There is no way for us to determine if there is any difference in wear 150,000 miles from now if you use a full synthetic or a blend so we tend to be cautious.
In the past, it might have been more true than it is today. These days, for the most part all major national brands are good gasolines. If you're buying from a mom and pop, there's no telling where they bought their fuel from and which detergents they have or don't have compared to major brands. If you care about the source of the crude, then brand matters. Alon and Valero are the only two I know of which use domestic crude oil only. Past that, most modern day gasolines are ok to use in just about any vehicle. Follow the manufacturer's recommendation for which grade as adding premium to a regular unleaded vehicle won't get you anything.EdP may support me on this one. When a boy I recall my father and his menfolk neighbors and such discussing cars of the time. Several men were conVINCED that one national gas company had better gas than another national company. I recall this well as I was at an impressionable age where I was learning to identify cars by make and model and pretending to know much more than I actually knew. Was it possible that one brand of gas (not octane) worked better in his car than another brand? I think so. Still, the oil discussion goes back to other petrol products, likely to kerosene and whale oil and coal and so on..
If you have the ability once your service contract ends, change your own oil. It shouldn't take more than 30 minutes to do yourself and you can save a lot of money and you'll know what you're getting. The filters are very economical if you get them from RockAuto and Amazon Basics oil is high quality and inexpensive. Total cost for the 6.5 qts and filter is less than $50 with tax and shipping. I've seen as much as $100 quoted for oil changes after the service contract ends.First oil change I had them use Quaker State Ultimate Durability 5W-30 (or so they said they did). Didn't pay a dime. This time I was supposed to be charged $20.59 for the full synthetic. Dealer said Genesis only covers synthetic blended oil. I asked for the same oil, but this time the invoice says Mobil One was used. Not a fan of that stuff. Oh well I guess. They reimbursed me this time for the oil. Sounds like all they carry now is Mobil One.
First time I used the valet service too. I wasn't in their system, they said they had issues a few months ago but thought it was resolved. Guess not, glad I called them this morning asking where the driver was! They got here within 1/2 an hour and car was done within two hours.
I'm pretty sure guarantee is wiped out only if it's determined that your oil is the cause of the failure.Odds are dealers aren't going to toss in some cheapo depot oil so I'm not worried about that (and have no desire to bring my own and trust they use it).
If they use theirs and do the work, they are 100% liable for any issues. If I bring mine, that guarantee is wiped out.
The Merit station in my home town had what they called Houston Oil, back in the day. Came in clear glass containers with metal funnels.Yes, and agree with you and Alfer. I don't think any of us can truthfully say Quaker State is better or worse than Castrol or any other brand. Unless you do a test under controlled condition you have no idea how well it is performing. Even cheap oils today are pretty good.
When I was a teenager and cars tended to use more oil than today, I'd often add a quart of re-refined oil from the Merit gas station. I think it was about 25 cents. I burned/leaked about a quart every 500 miles.